/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.sql.parser.sql.statement.generic;

import com.google.common.base.Optional;
import org.apache.shardingsphere.sql.parser.sql.segment.dml.predicate.WhereSegment;
import org.apache.shardingsphere.sql.parser.sql.segment.generic.TableSegment;

import java.util.Collection;

/**
 * Where segment available.
 */
public interface WhereSegmentAvailable {
    
    /**
     * Get where segment.
     *
     * @return where segment
     */
    Optional<WhereSegment> getWhere();
    
    /**
     * Set where segment.
     * 
     * @param where where segment
     */
    void setWhere(WhereSegment where);
    
    /**
     * Get tables.
     * 
     * @return tables
     */
    Collection<TableSegment> getTables();
}
